No. The Diameter is the length from one end to the next. The radius is half of that.
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One half the diameter = the radius Algebraically expressed as d/2 = r or d = 2r
Yes
If "3 inches" refers to the circle's diameter, then the radius is one-half of that.
4.8 cm The radius of any circle is one-half its diameter.
The radius is the distance from the center of a circle to one edge. The diameter of a circle is the distance from one side to the other that must cross the center of the circle. The diameter is 2 times the radius. Dia = 2R therefore, 2*38 cm = 76 cm